Mabeyn-i hümayun
Mâbeyn-i Hümâyûn (Ottoman Turkish: مابين همايون), sometimes expanded as Mabeyn-i Hümayun-ı Cenab-ı Mülukane (Ottoman Turkish: مابين همايون جناب ملوکانه) was the secretariat and primary administrative office of the Ottoman sultan, functioning as a central institution within the imperial palace. It served as the sultan's personal working space, handling state correspondence, petitions, decrees and receptions, effectively acting as a bridge between the private (harem) and public (selamlık) sections of the palace.